E-Mail Error with Outlook 2000/2002

[Graham]

I have a mixed Outlook environment with some users on
2000 and some on 2002. I am using Project 2002 and have
installed WGsetup.exe for e-mail collaboration. Users
with Outlook 2000 can see and update their tasks but
Outlook 2002 users (e.g. myself) get an error
message "There was a problem opening this message. You
may be using a mail program that differs from the one you
chose during setup".

Any help would be appreciated. Thanks.

Graham